If you want to write a letter to company after you have been notified that you have been unsuccessful from an interview then it is essential to ensure you can point out the reason why you were unsuccessful and just focus on that in your letter to follow up.
Think of your purpose for asking for information in a follow up letter. What do you hope to get out of it? Feedback is crucial so that you can avoid making the same mistakes in another interview but make sure that you can take any criticism with which the intention is made and that you are able to put that feedback to good use for your future.
If you are looking for an example, please see the below letter which you can use as a guide.
Follow Up Letter Example After Unsuccessful Interview
222 Every Road, Any Town, AA1 1BB
Mrs Jane Smith
Interview for POSITION follow up
Thank you for notifying me that on this occasion you are not going to take my application any further. I received your letter dated DATE and understand the decision that you have made.
I would like to understand your reasons for the decision and I wonder if you would be able to provide me with some more feedback so that I can take this on board for any future interviews I may have. I appreciate that this may be time consuming for you but I would really appreciate being able to learn from my mistakes and put any feedback that you give me to good use.
I would like to take this opportunity to thank you for inviting me to an interview and for spending the time with me that you did discussing the opportunity and your company. I thorough appreciate the time you gave me and I would like to wish you all well for the future.
I look forward to hearing from you.